I Turned into a Corpse Spirit!

In this world there are giant dragons, orcs, witches, marrow monsters, human warriors, ordinary mortals, and me, the zombie spirit who has traveled through time. Unfortunately, my identity feeds on the corpse gas of the dead. I breathe it three times a day, just like eating. If I don't breathe it for one meal, I will feel hungry. And because the same kind often digs into the graves of their ancestors, they have become the most hated characters among the aliens. In order not to be yelled at by everyone, I used my camouflage skills to hide the corpse energy, and at the same time I was looking for places of the same kind, because I didn't want to be immoral, I just wanted to pick up what was ready.